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Converter.js
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Converter.js
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function gregorian_to_jalali(gy, gm, gd) {
var g_d_m, jy, jm, jd, gy2, days;
g_d_m = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
gy2 = (gm > 2) ? (gy + 1) : gy;
days = 355666 + (365 * gy) + ~~((gy2 + 3) / 4) - ~~((gy2 + 99) / 100) + ~~((gy2 + 399) / 400) + gd + g_d_m[gm - 1];
jy = -1595 + (33 * ~~(days / 12053));
days %= 12053;
jy += 4 * ~~(days / 1461);
days %= 1461;
if (days > 365) {
jy += ~~((days - 1) / 365);
days = (days - 1) % 365;
}
if (days < 186) {
jm = 1 + ~~(days / 31);
jd = 1 + (days % 31);
} else {
jm = 7 + ~~((days - 186) / 30);
jd = 1 + ((days - 186) % 30);
}
return [jy, jm, jd];
}
function jalali_to_gregorian(jy, jm, jd) {
var sal_a, gy, gm, gd, days;
jy += 1595;
days = -355668 + (365 * jy) + (~~(jy / 33) * 8) + ~~(((jy % 33) + 3) / 4) + jd + ((jm < 7) ? (jm - 1) * 31 : ((jm - 7) * 30) + 186);
gy = 400 * ~~(days / 146097);
days %= 146097;
if (days > 36524) {
gy += 100 * ~~(--days / 36524);
days %= 36524;
if (days >= 365) days++;
}
gy += 4 * ~~(days / 1461);
days %= 1461;
if (days > 365) {
gy += ~~((days - 1) / 365);
days = (days - 1) % 365;
}
gd = days + 1;
sal_a = [0, 31, ((gy % 4 === 0 && gy % 100 !== 0) || (gy % 400 === 0)) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
for (gm = 0; gm < 13 && gd > sal_a[gm]; gm++) gd -= sal_a[gm];
return [gy, gm, gd];
}